Anthropic
High-performance model balancing intelligence and speed. Supports extended thinking and excels at coding, analysis, and complex instruction-following.
OpenRouter
Price record: 2026-10-03. Source: openrouter.
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Quality Score
1275
Arena ELO
Undisclosed
Parameters
1M
Context
This measures the amount of verifiable public evidence we have, not how capable the model is. A missing field means it has not been verified yet, not that its value is zero.
18 of 22 public signals
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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132.0K
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Dec 2025
Released
4/5 signals
3/4 signals
4/5 signals
3/4 signals
4/4 signals
Parameters
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Training compute
Not reported
Dataset scale
Not reported
Base model
Not reported
Source-reported access: API access · Likely confidence
Gaps we are still tracking
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
Claude-Sonnet-4 - LiveCodeBench
LiveCodeBench pass@1 59.4 across 1055 tasks
View sourceClaude-Sonnet-4 - LiveCodeBench
LiveCodeBench pass@1 59.4 across 1055 tasks
View sourceClaude-Sonnet-4 - LiveCodeBench
LiveCodeBench pass@1 59.4 across 1055 tasks
View sourceIntroducing Sonnet 4.6
It’s a full upgrade of the model’s skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. Sonnet 4.6 brings much-improved coding skills to more of our users. Performance that would have previously required reaching for an Opus-class model—including on real-world, economically valuable office tasks —is now available with Sonnet 4.6.
View sourceIntroducing Claude 4
Introducing Claude 4 \ Anthropic Skip to main content Skip to footer Research Policy Commitments Learn News Try Claude Announcements Introducing Claude 4 May 22, 2025 Today, we’re introducing the next generation of Claude models: Claude Opus 4 and Claude Sonnet 4 , setting new standards for coding, advanced reasoning, and AI agents. Claude Opus 4 is the world’s best coding model, with sustained performance on complex, long-running tasks and agent workflows. Claude Sonnet 4 is
View source1275
ELO Score
1269 - 1281
95% Confidence
+/-6 points
27.4K
Battles
Oct 3, 2026
Last Updated